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Abstract

This study reports facile hydrothermal strategies for the synthesis of novel ternary α-Fe2O3–ZnO–Au nanocomposites under mild conditions, through further surface coating of ZnO and Au nanoparticles (NPs) on α-Fe2O3 nanorods. The ternary α-Fe2O3–ZnO–Au nanocomposites are found to show (1) higher sensitivity/responses (S) of 113 and 57 toward 100-ppm n-butanol and acetone, respectively compared to single α-Fe2O3 (S = 11.7, 9.1 for n-butanol, acetone) and binary α-Fe2O3-ZnO (S = 54.4, 28 for n-butanol, acetone) sensing materials, and (2) lower optimum operating temperature, i.e., 225 °C. The enhanced sensitivity could be attributed to the chemical sensitization effect induced by the Au NPs, and the existence of conjugated depletion layers in the nanocomposites which promote a greater drop in resistance upon exposure to the gas. These results will be useful for future design of iron oxide-based ternary nanocomposites as gas-sensing materials with high sensitivity, selectivity and stability.

In an effort to develop nanostructured photocatalysts to achieve high performance in heterogeneous photocatalysis, a novel composite V 2O5/BiVO4/TiO2 photocatalyst was successfully synthesized by using a sequentially ...

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Curtin University would like to pay our respect to the indigenous members of our community by acknowledging the traditional owners of the land on which the Perth Campus is located, the Wadjuk people of the Nyungar Nation; and on our Kalgoorlie Campus, the Wongutha people of the North-Eastern Goldfields.Watch our traditional Aboriginal welcome